Transmission range extension by applying dual carrier modulation (dcm) with distributed tone resource unit (dru)

Abstract

A method performed by a wireless device to extend an effective transmission range of a physical layer protocol data unit (PPDU). The method includes transmitting a PPDU that includes a preamble and a data field, wherein the data field is transmitted in a plurality of distributed-tone resource units (dRUs) each carrying a same set of data symbols. A different mapping of the same set of data symbols to tone positions may be used in different ones of the plurality of dRUs to increase frequency diversity.

What is claimed is: 
     
         1 . A method performed by a wireless device, the method comprising:
 transmitting a physical layer protocol data unit (PPDU) that includes a preamble and a data field, wherein the data field is transmitted in a plurality of distributed-tone resource units (dRUs) each carrying a same set of data symbols.   
     
     
         2 . The method of  claim 1 , wherein a different mapping of the same set of data symbols to tone positions is used in different ones of the plurality of dRUs. 
     
     
         3 . The method of  claim 2 , wherein a mapping of the same set of data symbols to tone positions used in one of the plurality of dRUs is shifted relative to a mapping of the same set of data symbols to tone positions used in another one of the plurality of dRUs. 
     
     
         4 . The method of  claim 1 , wherein the plurality of dRUs includes a first dRU and a second dRU, wherein data symbols mapped to negative subcarrier indices allocated to the first dRU are mapped to positive subcarrier indices allocated to the second dRU, and wherein data symbols mapped to positive subcarrier indices allocated to the first dRU are mapped to negative subcarrier indices allocated to the second dRU. 
     
     
         5 . The method of  claim 4 , wherein the first dRU is a first 26-tone dRU and the second dRU is a second 26-tone dRU. 
     
     
         6 . The method of  claim 5 , wherein the first 26-tone dRU is 26-tone dRU1 and the second 26-tone dRU is 26-tone dRU2, the first 26-tone dRU is 26-tone dRU3 and the second 26-tone dRU is 26-tone dRU4, the first 26-tone dRU is 26-tone dRU6 and the second 26-tone dRU is 26-tone dRU7, or the first 26-tone dRU is 26-tone dRU8 and the second 26-tone dRU is 26-tone dRU9. 
     
     
         7 . The method of  claim 4 , wherein the first dRU is a first 52-tone dRU and the second dRU is a second 52-tone dRU. 
     
     
         8 . The method of  claim 7 , wherein the first 52-tone dRU is 52-tone dRU1 and the second 52-tone dRU is 52-tone dRU1 or the first 52-tone dRU is 52-tone dRU3 and the second 52-tone dRU is 52-tone dRU4. 
     
     
         9 . The method of  claim 4 , wherein the first dRU is a first 106-tone dRU and the second dRU is a second 106-tone dRU. 
     
     
         10 . The method of  claim 1 , wherein the plurality of dRUs includes a first dRU, a second dRU, a third dRU, and a fourth dRU. 
     
     
         11 . The method of  claim 10 , wherein mappings of the same set of data symbols to tone positions used in the second dRU, third dRU, and the fourth dRU are shifted by different amounts relative to a mapping of the same set of data symbols to tone positions used in the first dRU. 
     
     
         12 . The method of  claim 11 , wherein the first dRU is 26-tone dRU1, the second dRU is 26-tone dRU2, the third dRU is 26-tone dRU3, and the fourth dRU is 26-tone dRU4. 
     
     
         13 . The method of  claim 1 , wherein the preamble includes a universal signal (U-SIG) field and a repeated universal signal (RU-SIG) field, wherein the RU-SIG field is a repetition of the U-SIG field. 
     
     
         14 . The method of  claim 13 , wherein the U-SIG field includes an indication of a dual carrier modulation (DCM) index and an indication of a dRU size. 
     
     
         15 . The method of  claim 1 , wherein the preamble includes a legacy short training field (L-STF) field, a legacy long training field (L-LTF) field, a legacy signal (L-SIG) field, and a repeated legacy signal (RL-SIG) field, wherein the L-STF field, the L-LTF field, the L-SIG field, and the RL-SIG field are transmitted using a higher transmission power compared to a transmission power used to transmit the data field. 
     
     
         16 . The method of  claim 1 , wherein the preamble includes an ultra high reliability legacy training field (UHR-LTF) field and a repeated ultra high reliability legacy training field (RUHR-LTF) field, wherein the RUHR-LTF field is a repetition of the UHR-LTF field. 
     
     
         17 . The method of  claim 1 , wherein the PPDU is a trigger-based PPDU that is triggered by an access point (AP). 
     
     
         18 . The method of  claim 17 , wherein the preamble does not include a legacy signal (L-SIG) field or a universal signal (U-SIG) field. 
     
     
         19 . The method of  claim 18 , wherein the preamble includes an ultra high reliability signal (UHR-SIG) field that carries information regarding the data field. 
     
     
         20 . The method of  claim 19 , wherein the information regarding the data field includes one or more of: modulation coding scheme (MCS) information, resource unit (RU) allocation information, and bandwidth information. 
     
     
         21 . The method of  claim 19 , wherein the preamble further includes a repeated ultra high reliability signal field (RUHR-SIG) field, wherein the RUHR-SIG field is a repetition of the UHR-SIG field. 
     
     
         22 . The method of  claim 1 , wherein the data field is duplicated within the PPDU in units of 20 Megahertz (MHz). 
     
     
         23 . A wireless device comprising:
 a radio frequency transceiver;   a memory device storing a set of instructions; and   a processor coupled to the memory device, wherein the set of instructions, when executed by the processor, causes the wireless device to:
 transmit a physical layer protocol data unit (PPDU) that includes a preamble and a data field, wherein the data field is transmitted in a plurality of distributed-tone resource units (dRUs) each carrying a same set of data symbols. 
   
     
     
         24 . The wireless device of  claim 23 , a different mapping of the same set of data symbols to tone positions is used in different ones of the plurality of dRUs.